陸地棉の開花開絮に関する栽培学的研究(予報)

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1. The most optimum sowing period and pinching position of main stem were studied by investigating the date of opening of the flower and ripening of the boll. 2. The sowing periods are as follows; May 7,22,June 6,21 and July 6 (15 days interval). 3. There is a decided tendency toward regularity in blooming, as other investigators reported, the vertical intervals being approximately 3 days, and the horizontal intervals approximately 7 days (one day longer than that of McCLELLAND reported). -Fig. 1 4. The days from sowing to blooming (X) are closely correlated with those from blooming to ripening of a boll (Y). - Table 4. As a general formula presented as follows, Y=(0.268x^2/2,700+0.092x/90+1.857)X+(54.258x/45-163.731) where, designates the days from the date of possibly sowing (here we assume the date reached average temperature 18℃ in spring and in Kyoto, April 7) to practically sown. 5. By this formula we can calculate as shown Table 5. It has been estimated at least 40 days needed from blooming to ripening of the boll, so we can assume the date of first ripening of a boll as shown by dotted line, but after the period of sowing June 6 the theoretical value does not coincide with experimental value, so we assumed this noncoincidence was owing to the accumulated temperature (we revealed some 3,200℃ at least, was needed from sowing to ripening of a boll), and here adjusted as shown by a fine solid line. 6. If we stop harvest at last decade November, the last date of effective blooming is limited by a thick solid line, therefore the period of effective blooming falls between fine and thick solid line. 7. From these data the most desirable sowing period is advisably May 7-22. 8,From Fig. 1 and Table 5 we can decide the pinching position of the main stem (generally done in intensive cultivation as in Japan).
神戸大学の論文

陸地棉の開花開絮に関する栽培学的研究(予報)

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